Hello there!
Let's take note and remember. Inside the (Earth's core) they're lava deep within it's core. And when talking about lava, lava is obviously a liquid. And not only that, it's very hot deep with there.
Therefore, from now considering this information, your correct answer would then be (option b).
A . Hot and solid
B . Hot and liquid
C . Cool and solid
D . Cool and liquid
I hope this helps you!